Which 5s Mutant deserves the AG?

I have 4 strong Mutants as 5s. Domino and AA are r4 , Omega Red is r3, Iceman is r2.

Comments

If you are gonna do omega red them you need to have the Sig stones to put in him

Got 50 sig stones

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If you are gonna do omega red them you need to have the Sig stones to put in him

Is that essential for awakening him or just provides more damage?